Improvement in grinding-mills



Z Sheets-Sheet 1.

T. D. POWERS. GRINDING-MILL.

Patented March 6,1877.

INVENTOR:

ATTEST:

N-PETERSI PHQTD-LITHOGRAPMER, WAiH NGTON, D C.

- down between the grindingsurfaces.

UNIT STATES THEODORE POWERS, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ALLHIS.

PATENT OFFIGE.

EIGHT o JAMES. A. FIELD, OF SAME PLACE.

IMPROVEMENT IN GRINDING-MILLS.

Specification forming part of Letters Patent No. 188,184, dated March 6,1877; application filed September 8, 1876.

1'0 all whom it may concern Be it known that I, THEODORE D.POWERS, ofthe city and county of St. Louis, and State of Missouri, have inventedcertain Improvements in Grinding-Mills, of which the following is aspecification, reference being had to the accompanying drawings.

This invention belongs to the class of castiron mills, and is suitablefor grinding corn, either shelled or with the cob, or cob and husk.

In my improvement the inner grinder or cone is fixed, and the outergrinder or concave rotates.

Myinvention consists, in part, in constructing the outer shell of thegrinder in two parts, adjustable relatively by stay-screws anddistance-screws, as hereinafter described.

The invention further consists in combining, with the outer revolvingshell, an inner cone having teeth with points or angles of varyingheight.

' The invention further consists in constructing a stirring arm or framewith a ribbed or flanged hub for fixing it relatively to the centerblock or post of the cone, as hereinafter described.

In the drawings, Figure 1 is an axial sec tion of the mill. Fig. 2 is anenlarged detail section at a: .10. Fig. 3 is a perspective view of theinner grinder. Fig. 4 is a perspective view of the outer grinder,showing the-interior of same.

A is the lower portion or base of the inside grinder or cone. This isfixed to the bedframe by bolts passing through the lugs 11. Thegrindingsurface of A is divided into sections by teeth 0), extendingfrom top tobottom of A, and somewhat inclined from the vertical, so asto tend to feed the grain through the mill. These teeth project fartherfrom the surface'at the top than at the bottom of A, so that the mealbecomes finer as it passes Between the teeth a are teeth a which areplaced parallel with the tooth 0. upon one side, and, like those 0 theteeth a? project farther as they extend upward.

The upper portion B of the inside grinder has a surface nearly in linewith A, and projecting blades or ribs b, matching at the lower ends withthe teeth a These blades are made angular in outline, as shown, andtheir edges are somewhat inclined from the vertical in the samedirection as the teeth a a so as to teudto carry the stuff being grounddown through the mill. The blades 1) are formed with the angle b ofvarying height, so as to leave spaces between the larger blades, intowhich whole ears of corn may fall. The portions A B are fitted togetherwith a rabbetjoint, A and held by bolts A The apex of the insidegrinderA B is formed into a cylindrical block or post, 0, on which fitsthe hub of the breaker D. The hub 11 of the breaker has ribs 01 castupon its inner side, which rest in suitable recesses or slots in thepart 0, and the hub is held down on O by a screw, E, and washer F.Projecting from the hub d are arms (1 which I prefer to make curved, asshown, so as to cause no sudden jar when an ear of corn is pinchedbetween the breaker-arms and the radial arms of the outer grinder. b isa shoulder all around the base of O, which forms the bearing of outergrinder G H. The outer grinder-whioh is the runnerhas a lower portion,G, of the same height as A, and having teeth g 9 similar to those a 0.but inclined in the opposite direction, so as to tend by theirinclination to force the meal downward. The rotation of the outergrinder, as shown, is in the direction of the arrow; but it is obviousthat the teeth may have an opposite inclination, and the runner or outergrinder have rotation in an opposite direction. The upper portion H ofthe outer grinder or runner has blades h, whose edges fit the edges ofthe blades b upon the inner or fixed grinder, and the edges of theblades b and h have such relative inclination to each other that theyact together as shears to cut up the corn, cobs, and husks passing downbetween portions B and H. Arms I extend inwardly from H to abearingcollar, J, having bearing on the surface b. The arms I turnbetween the breaker-arms d and the blades b, the lower side of the armsI passing in close contact with the upper edges of the largest of theblades b, so as to break and slice the ears of corn passing down.

The upper and lower portions of the outer grinder G H are formed withflanges g h, having bolt-holes for the passage of the stay and distancescrews h h, which secure the parts adjustably together. The upper edgeof the portion H turns outward in a flange, K, on the under side ofwhich is a cog-gear, k, extending all around and engaged by a bevelcog-wheel, L, by which the outer grinder is turned. L is a hopperattached to the rim K.

I claim- 1. The outer grinder made in two parts, G H, in combinationwit-h the adjusting-screws h h, substantially as and for the purpose setforth.

THEODORE D. POWERS.

Witnesses:

ROBERT BURNs, N. W. MERRILL.

